Farn

The Farn were an intelligent species assimilated by the Borg. Prior to their assimilation, the Farn were enemies with the Parein. A number of Farn drones on a planet in the Nekrit Expanse, liberated from the Borg Collective, chose to resume their old conflict with the Parein. Their fighting continued until the neural link between them was re-established and they became part of the Borg Cooperative. (VOY: "Unity")